3680437
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3680437, is a component manufactured by Cummins. This screw plays a significant role in the maintenance and operation of commercial trucks. Cummins, a well-established name in the automotive industry, ensures that this part meets the rigorous demands of heavy-duty applications ¹.

Basic Concepts

Hexagon Flange Head Cap Screws are designed with a hexagonal head and a flange that provides a larger bearing surface. This design allows for efficient torque application and reduces the risk of cam-out during installation ². In the automotive industry, these screws are commonly used for fastening components that require high tensile strength and resistance to loosening. Their design makes them suitable for applications where vibration and dynamic loads are present.

Purpose and Role in Truck Operation

The 3680437 Hexagon Flange Head Cap Screw serves a specific purpose in commercial truck operations. It is used to secure various components, ensuring structural integrity and reliable performance. By providing a strong and stable connection, this screw helps maintain the alignment and functionality of critical parts within the truck’s system ³.

Key Features

The 3680437 Hexagon Flange Head Cap Screw features a hexagonal flange head, which offers several advantages. The hexagonal shape allows for easy installation and removal using common tools, while the flange provides additional surface area to distribute the load and prevent the screw from digging into the material. The screw is made from high-quality materials, ensuring durability and resistance to corrosion. Its thread specifications are designed to provide a secure fit and optimal performance in demanding environments.

Benefits

The 3680437 Hexagon Flange Head Cap Screw offers several benefits. Its design enhances fastening strength, making it less likely to loosen over time. The flange head provides additional stability, reducing the risk of component misalignment. Additionally, the screw’s compatibility with various applications in commercial trucks makes it a versatile choice for maintenance and repair tasks.

Installation Guidelines

To install the 3680437 Hexagon Flange Head Cap Screw, follow these steps:

1. Ensure the mating surfaces are clean and free of debris.
2. Use the appropriate tool to begin threading the screw into the designated hole.
3. Apply torque gradually to avoid cross-threading.
4. Continue tightening until the screw is fully seated and the flange is flush with the surface.
5. Verify the torque specifications provided by the manufacturer to ensure the screw is tightened to the correct level.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws include loosening and corrosion. To address these problems:

• Regularly inspect screws for signs of loosening and retighten as necessary.
• Apply a corrosion-resistant coating to protect against environmental factors.
• Replace screws that show signs of wear or damage to maintain structural integrity.

Cummins Overview

Cummins Inc. is a leading manufacturer of diesel engines, natural gas engines, and related technologies. With a history of innovation and commitment to quality, Cummins has established a strong reputation in the automotive industry. The company’s focus on producing high-quality components ensures that their products, like the 3680437 Hexagon Flange Head Cap Screw, meet the demanding requirements of commercial vehicles.

Hexagon Flange Head Cap Screw 3680437 Compatibility with Cummins Engines

The Cummins Hexagon Flange Head Cap Screw, part number 3680437, is a versatile component designed to fit a variety of Cummins engines. This screw is essential for securing various parts within the engine assembly, ensuring that components remain tightly fastened and properly aligned.

Compatibility with Specific Engine Models

• 6C8.3, B6.7 CM2350 B135B, B6.7 CM2670 B153B, ISB/ISD 6.7 CM2150 SN, ISB 6.7 G CM2180 B118, ISBE CM800, ISBE4 CM850, ISC CM2150, ISC CM554, ISC CM850, ISC 8.3 CM2250, ISL CM2150, ISL CM554, ISL G CM2180, ISL 9 CM2150 SN, ISL 9 CM2250, ISM CM570, ISM CM570/870, ISM CM876, ISM 11 CM876 SN, ISX CM570, ISX 12 CM2350 X102, ISX 12 G CM2180 EJ, ISX 12/ISX 11.9 CM2250, ISZ 13 CM2150 Z105

The 3680437 screw is engineered to fit seamlessly with these engines, providing a reliable fastening solution. Its design allows for easy installation and removal, making it a preferred choice for both routine maintenance and more complex engine repairs.

Grouping by Engine Series

• ISB/ISD 6.7 Series

The ISB/ISD 6.7 engines, including models such as CM2150 SN, G CM2180 B118, and CM2670 B153B, benefit from the 3680437 screw in maintaining the integrity of their assemblies. This screw is particularly useful in securing components that are subject to high stress and vibration.

• ISBE/ISBE4 Series

Engines like ISBE CM800 and ISBE4 CM850 utilize the 3680437 screw to ensure that critical parts remain securely fastened, contributing to the overall reliability and performance of the engine.

• ISC Series

The ISC engines, including CM2150, CM554, CM850, and 8.3 CM2250, rely on this screw for various applications, from securing engine covers to fastening internal components.

• ISL Series

For ISL engines such as CM2150, CM554, G CM2180, 9 CM2150 SN, and 9 CM2250, the 3680437 screw provides a robust fastening solution that can withstand the demands of heavy-duty operations.

• ISM Series

The ISM engines, including CM570, CM570/870, CM876, and 11 CM876 SN, benefit from the precise fit and secure hold of the 3680437 screw, ensuring that all engine parts are properly aligned and fastened.

• ISX Series

Engines such as ISX CM570, ISX 12 CM2350 X102, ISX 12 G CM2180 EJ, and ISX 12/ISX 11.9 CM2250 use the 3680437 screw for critical fastening applications, ensuring that the engine operates smoothly and efficiently.

• ISZ Series

The ISZ 13 CM2150 Z105 engine also relies on the 3680437 screw for its fastening needs, providing a reliable and secure connection for various engine components.

This comprehensive compatibility ensures that the 3680437 screw is a valuable tool for maintaining and repairing a wide range of Cummins engines.

Hexagon Flange Head Cap Screw (Part 3680437) Component Usage

The Hexagon Flange Head Cap Screw, identified by part number 3680437, is a versatile fastener utilized across various engine systems to ensure secure and reliable connections. Its design allows for efficient torque application and resistance to loosening, making it suitable for several critical applications within engine assemblies.

Aftercooler Water Plumbing

In the aftercooler water plumbing system, the Hexagon Flange Head Cap Screw is employed to fasten components such as fittings, brackets, and support structures. This ensures that the plumbing remains intact under varying pressure conditions, contributing to the efficient cooling of compressed air and maintaining system integrity.

Air Transfer Connection

For air transfer connections, this screw plays a role in securing hoses, pipes, and connectors. Its flange head provides a broad contact surface, which helps distribute clamping force evenly, reducing the risk of leaks and ensuring a stable air supply to various engine components.

Engine Lubricating Primer

Within the engine lubricating primer system, the Hexagon Flange Head Cap Screw is used to attach the primer pump to the engine block or other structural elements. This secure attachment is essential for the primer’s operation, ensuring that oil is effectively circulated before engine start-up, thereby protecting moving parts from wear.

Fan Drive

In fan drive applications, this screw is critical for mounting the fan drive mechanism to the engine. It helps maintain alignment and secure attachment, which is vital for the fan’s efficient operation in cooling the engine and other components.

Fan Drive Mounting

Similarly, for fan drive mounting, the Hexagon Flange Head Cap Screw ensures that the fan drive is firmly attached to its housing or the engine frame. This secure mounting is necessary for withstanding the dynamic forces generated during operation.

Flywheel Housing

The screw is also utilized in the flywheel housing to fasten covers, brackets, and other ancillary components. This application ensures that the housing remains sealed and protected, contributing to the overall stability and performance of the flywheel system.

Front Engine Support

In the front engine support structure, the Hexagon Flange Head Cap Screw is used to attach support brackets and mounts. This helps in maintaining the engine’s position within the vehicle, absorbing vibrations, and ensuring smooth operation.

Front Gear Housing

For the front gear housing, this screw secures covers, plates, and other components, ensuring that the housing remains intact and protected from external elements. This is important for the precise operation of the gears and the overall functionality of the engine.

Lubricating Oil Pump

In the lubricating oil pump system, the Hexagon Flange Head Cap Screw is used to fasten the pump to the engine block or other structural components. This secure attachment is essential for the pump’s stable operation, ensuring consistent oil flow and pressure throughout the engine.

Radiator Mounting

Finally, in radiator mounting applications, this screw is used to attach the radiator to the vehicle’s frame or support structure. This ensures that the radiator remains firmly in place, allowing for efficient heat dissipation and maintaining the engine’s optimal operating temperature.

Conclusion

The 3680437 Hexagon Flange Head Cap Screw is a critical component in the maintenance and operation of commercial trucks, particularly those equipped with Cummins engines. Its design, featuring a hexagonal flange head, provides efficient torque application, resistance to loosening, and durability in demanding environments. This screw is versatile, compatible with a wide range of Cummins engine models, and essential for securing various components within engine assemblies. Proper installation, regular maintenance, and understanding its applications ensure the continued reliability and performance of commercial vehicles.